I have shot a few weddings with strobes for a different effect. They allow you to get some shots that would otherwise be impossible (group dance shots come to mind), but the glowing ceiling and bright room is a giveaway that they were used. They do give you the power to shoot a rapid series of shots that can be good in moderation though. The shots definitely lose a lot of the atmosphere of the room.
Try to setup the lights in two corners along the same wall, you need to be able to keep the lights out of the frame or you will have a giant blown out portion of the image. If you set them up in opposite corners, you will almost always have a light in the picture.
Definitely get wireless transmitters or every other wedding patron will end up with just white pictures. If you use a cable triggered transmitter (ie a pocket wizard hooked up with a pc cable), it is easy to switch between on camera and off camera flash (pull cable & switch on flash). The wireless transmitters I use are hotshoe only (with no power switch), so switching requires pulling off the transmitter and sliding the off-camera cord in.
It is good to play and I am glad I have some experience with the big lights, but I still prefer local flash on a stroboframe (large, tried a small one and hated it) with a diffuser for the majority of the shots. That maintains the atmosphere in the room but still softens the light some.
Make sure you get the lights set up plenty early as it will take some fiddling to get reasonably even distribution (and level) and avoid strange shadows. I normally set one light to give me ISO 400,f4,1/125 and the second 400,f4,1/60 (roughly at the center of the action). That gives me some room to adjust exposure by changing shutter speed (or ISO) and some definition to the light. I am still not perfectly happy with the setup, but I have used it a few times and gotten some decent shots. Btw, I set everything up for ISO400 so that when I switch to the on camera flash, it doesn't have to work as hard. Changing ISO back and forth is slow and easy to forget.
Good luck.